It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 423 742 is not a prime number.
For example, 423 742 can be divided by 2: 423 742 / 2 = 211 871.
For 423 742 to be a prime number, it would have been required that 423 742 has only two divisors, i.e., itself and 1.
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423 742 is an even number, because it is evenly divisible by 2: 423 742 / 2 = 211 871.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 423 742 is about 650.955.
Thus, the square root of 423 742 is not an integer, and therefore 423 742 is not a square number.
The square of a number (here 423 742) is the result of the product of this number (423 742) by itself (i.e., 423 742 × 423 742); the square of 423 742 is sometimes called "raising 423 742 to the power 2", or "423 742 squared".
The square of 423 742 is 179 557 282 564 because 423 742 × 423 742 = 423 7422 = 179 557 282 564.
As a consequence, 423 742 is the square root of 179 557 282 564.
The multiples of 423 742 are all integers evenly divisible by 423 742, that is all numbers such that the remainder of the division by 423 742 is zero. There are infinitely many multiples of 423 742. The smallest multiples of 423 742 are: